Declan Ganley's Rivada Networks is confident it has a "strong" bid to win the contract to roll out a new broadband network in the United States dedicated to public safety.

The platform is designed to provide a nationwide network for the country's police, firefighters, paramedics, and other public safety agencies.

Ganley said the company has recently completed an equity fundraising on top of an earlier $50m fundraising.

However, he would not reveal further details of the investment.

The final deadline for bids is May 31.

Ganley has said expects the competition for the contract to be fierce and that his company will be "shouting it from the rooftops" if it wins the contract.

The First Responder Network Authority (FirstNet), the US government authority with responsibility for the network, has told potential bidders that they should expect to receive up to $6.5bn of funding support from it.

"This broadband network will fulfil a fundamental need of the public safety community as well as the last remaining recommendation of the 9/11 Commission," reads the First Net website.

"FirstNet will bring 21st Century tools to millions of organizations and individuals that respond to emergencies at the local, state, tribal and federal levels," it continues.

"First responders need a reliable, resilient broadband network to perform their life saving mission. Most teenagers today own smartphones that are more powerful communications devices than those typically used by the public safety community.

"In many cases, emergency responders have to bring their own smartphones to work to access applications, search databases and share videos. FirstNet will facilitate the use of rugged, easy-to-use devices designed to meet public safety requirements.

"Public safety needs an exclusive network so they can communicate without interruption."